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Disclosures about Fair Value of Assets and Liabilities - Fair Value Measurements of Assets and Liabilities Recognized on a Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | $ 767,230 | $ 600,348
U.S. Treasury and Federal Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 9,909 | 16,608
State and Municipal [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 347,101 | 209,303
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 246,083 | 185,003
Federal Agency Mortgage-backed Pools [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 145,597 | 178,736
Corporate Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 18,540 | 10,698
Recurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 767,230 | 600,348
Recurring Basis [Member] | U.S. Treasury and Federal Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 9,909 | 16,608
Recurring Basis [Member] | State and Municipal [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 347,101 | 209,303
Recurring Basis [Member] | Federal Agency Collateralized Mortgage Obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 246,083 | 185,003
Recurring Basis [Member] | Federal Agency Mortgage-backed Pools [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 145,597 | 178,736
Recurring Basis [Member] | Corporate Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 18,540 | 10,698
Recurring Basis [Member] | Hedged Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 320,306 | 209,161
Recurring Basis [Member] | Forward Sale Commitments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 266 | 135
Recurring Basis [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | (23,343) | (1,801)
Recurring Basis [Member] | Commitments To Originate Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | (228) |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 767,230 | 600,348
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury and Federal Agencies [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 9,909 | 16,608
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and Municipal [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 347,101 | 209,303
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal Agency Collateralized Mortgage Obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 246,083 | 185,003
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal Agency Mortgage-backed Pools [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 145,597 | 178,736
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Notes [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total available-for-sale securities, Fair Value | 18,540 | 10,698
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Hedged Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 320,306 | 209,161
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Forward Sale Commitments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | 266 | 135
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | (23,343) | $ (1,801)
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commitments To Originate Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, fair value | $ (228) |

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